Uploaded July 2019 | Updated September 2026, 1 hour ago

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bristolwatch.com/ele3/1g.htm
The Vishey VOM1271T is available from Mouser Electronics for $2.33 each or $1.94 each Qty 10.
An alternative is the Toshiba TLP3906 $2.08 each or $1.69 each Qty 10.
High Voltage IGBT H-Bridge Using Photovoltaic Optocouplers
youtu.be/azJo4h-ei6I